说明：  实现仿真信号的胡相关处理降噪，可以实现被白噪声污染的信号中有用信号的提取，并进行了fft变换，可以清晰的看清信号的频谱
(Hu correlation processing to achieve the simulated signal noise, white noise contaminated signal in the extraction of the useful signal can be achieved, and fft transform, you can clearly see the frequency spectrum of the signal)